By Valentina Za and Claudia Cristoferi MILAN (Reuters) – Leonardo Del Vecchio leaves a business empire worth 27 billion euros ($29 billion), ranging from the eyewear company that was his life’s work to the stake in merchant bank Mediobanca he built in his 80s. Del Vecchio, who died aged 87 on Monday, was Italy’s second-richest man, according to Forbes. His departure raises questions about the future of the various businesses in which his Delfin holding company was a leading investor. Del Vecchio’s second wife Nicoletta Zampillo, whom he remarried in 2010 seven years after their divorce, stands…